Removing accessibility "Collapse" action from QS when in split shade

This action resulted in broken QS state in split shade and didn't make much sense as QS can't be collapsed.
Now this action is dependent on split shade state and is only announced in non-split shade.

Fixes: 269462512
Test: QSPanelControllerTest
Test: talkback on -> open split shade -> focus on QS -> tap with three fingers -> see no "Actions" in menu
Change-Id: I007f0e87d41a36bd71c28d95f566335852e2e732